MyBB (aka MyBulletinBoard) before 1.4.12 does not properly handle a configuration with a visible forum that contains hidden threads, which allows remote attackers to obtain sensitive information by reading the Latest Threads block of the Portal Page.
blog.mybb.com/2010/04/13/mybb-1-4-12-released-security-maintenance-update/
community.mybb.com/thread-66255.html
dev.mybboard.net/issues/809
openwall.com/lists/oss-security/2010/10/08/7
openwall.com/lists/oss-security/2010/10/11/8
openwall.com/lists/oss-security/2010/12/06/2
exchange.xforce.ibmcloud.com/vulnerabilities/64517